Air vent cover



FIG. 1 is a top, front, left-side perspective view of an air vent cover, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof; and

FIG. 7 is a right-side elevational view thereof. 

The ornamental design for an air vent cover, as shown. 